Woodworking machine



Aug. 11, 1936.

H. G. PIPER WOODWORKING MACHINE Filed July sq, 1935 2 Sheets-Sheet 1 ifiInventor Attorney Aug. 11, 1936. I PIPER f Y 2,050,462

. WOODWORKING MACHINE Filed July so, 1935 2 Sheets-Sheet g Inventorfidrnlh G. Iipn Attorney Patented Aug. 11, 1933 UNITED STATES PATENTOFFICE Canad Application July 30, 1935, Serial No. 33,863

3 Claims.

My present invention relates to improvements in wood working machinesand the invention may be embodied in the machine as a unitary partthereof, or the invention may be utilized as an attachment for woodworking machines. The primary object of the invention is the provisionof means for providing eased-edges at the four corner edges of theboard, plank, or other stock, which is accomplished eliminating theusual sharp edges and substituting therefor rounded edges.

This rounding of the edges or corners of the stock is attained while thestock is being fed through the wood working machine, as for instance aplaner, and the edges are preferably rounded after the surface of thestock has been planed, but while the stock is still being fed throughthe planer and retained therein.

In carrying out my invention I provide means for applying pressureagainst the corner edges of the stock by means of which the sharp corneredges are pressed or compacted into or against the body of the stock,and preferably these pressed edges are rounded, or have imparted theretoa convex surface which is smooth and merges with the dressed or finishedsurfaces of the stock.

In utilizing the device of my invention on stock that is rectangular incross section I employ two sets or pairsof the presser tools, one set ateach side of the stock, and each set of tools rubs down or smooths androunds out the sharp corner-edges at one side of the stock.

The invention consists essentially in certain novel combinations andarrangements of parts as will hereinafter be more fully set forth andclaimed. In the accompanying drawings I have illustrated one completeexample of the physical embodiment of my invention, wherein the partsare combined and arranged according to the best mode I have thus fardevised for the practical application of the principles of my invention,but it will be understood that changes and alterations may be made inthis exemplifying structure within the scope of my appended claims,without departing from the principles of my invention.

Figure 1 is a conventional view showing the action of the four presserblades, simultaneously, at the four corner edges of a piece of stockthat is rectangular in cross section.

Figure 2 is a perspective view of one of a pair of standards or baseblocks employed for supporting the tools, it being understood that oneof these blocks or standards is used at each side of the stock.

Figure 3 is an enlarged, fragmentary view of a standard, showing its twopresser blades rubbing down complementary corner edges of the stock asthe latter is fed through the wood working machine.

Figure 4 is a perspective view of one of the four 5 presser bladesshowing the bearing face or sharper-groove which contacts with the sharpcorner edge of the stock.

Figure 5 is a perspective view of one of the tool holders orpresser-blade holders, with the blade omitted.

In carrying out my invention I employ two standards or base blocks, oneof which is illustrated in the drawings for use at the right hand sideof the planer, and the other, not shown, is used at the left hand sideof the planar, or other suitable wood working machine.

The standard I is supported above the stock S, which, as indicated,moves or is fed from left to right in Figure 3 in usual manner, asbetween clamping rolls or guides, and the standard or base block I isfashioned with a vertically extending slot 2, and spaced guide lugs 3,by means of which the block may be rigidly fastened, as by bolts, to astationary part of the wood working machine to which the device of myinvention is attached. The base block is verticaly adjustable withrelation to the stock S in order to adapt the presser tools to difierentthicknesses of stock, and the presser tools are adjustable foradaptation to 0 various widths of stock.

The base block I is fashioned with a laterally extending arm 4, and thisarm is provided with a vertically extending socket 5. A similar socketor cylindrical hole 6 is provided in the body of the a block, whichsocket, as indicated, extends diagonally through the body of the block.

In these two sockets the tool holders of a pair of tools are supported,and the holders are shown as pins 1 and 8 having reduced heads 1 to fitin the sockets and shoulders 8 to fit against the supporting armoragainst the body of the block. The reduced heads are pierced toaccommodate cotter pins 9 that extend transversely through these heads,and the pins 1 and 8 are thus securely mounted in the block, but theyare free to turn in their sockets.

The lower, free end of each pin is fashioned with a longitudinallyextending slot I0 having opposed flat inner walls, and each pin isprovided with a spring H coiled about its upper portion, one end of thespring being anchored to a stud l2 rigid with the block, or right withthe blockarm, and the other end of the spring is anchored in the slotID, as indicated. The tendency of the 55 spring is to turn the pin orholder clock-wise, but the turning action of the spring is limited bythe use of a stop lug l3 on the holder-pin and a stop pin or stop lug l4rigid with the block, or the block-arm and located in the path of theturning movement of the holder-pin.

These holder-pins each have a presser blade 15 mounted in the slottedportion of the pin and the blades are flattened to fit snugly in theslots of the pins. The blades are adjustable in their slotted holders inorder that the four blades may be adjusted to point to the fourcomplementary corner edges of the stock S, as in Figure 1, and eachblade is fashioned with a concave end forming a curved bearing seat l6.These curved bearing-seats or bearing-faces frictionally engage the foursharp corner edges of the stock, to rub down the sharp edges that havepreviously been formed by the planing tools of the wood working machine.

By means of set screws or bolts H, or in other suitable manner, theblades, after being adjusted to the proper angles to bear on the corneredges of the stock, are rigidly fixed in their slotted holder-pins.

The holders and the blades are interchangeable and can be employed foruse with any one of the four corner edges of the stock, and the use ofthe slots H3 in the holder pins provides a wide range of angularadjustment with relation to the pins, as well as for longitudinaladjustment of the blades with relation to their supporting holderpins.As thus arranged, the four presser blades may readily be adjusted tostock of various dimensions, and each blade may be located in therequired position to bear against a complementary sharp corner edge, andround that edge to conform to the exact shape and curvature of the otheredges of the stock.

The springs of the tools tend to swing the working ends of the bladesagainst, or in direction opposite to that of the travel of the stock,

and the sharp corner C of the stock is rounded as at R by pressure ofthe curved bearing face It: on the sharp corner C. The presser bladesare automatically swung to operative position by the front end of thestock as the latter moves from left to right in Figure 3. As the frontend of the stock contacts with a blade, the latter is swung on the axisof the holder-pin which turns in its socket and thereby places thespring I I under tension. As the stock is fed through the machine thebearing face 16 rubs on the sharp edge or corner of the stock withsufiicient friction, under pressure of the spring I! to press in, rubdown, or compact the sharp edge into a rounded or convex edge that issmooth and which merges with the planed surfaces of the stock.

It will be understood that only a comparatively slight displacement ofthe wood is intended, merely smoothing down or rounding off the sharpcorner edge of the stock, and therefore no substantial pressure isapplied by the tools to displace the stock, and the arrangement of thesets of tools at opposite sides of the stock neutralizes the pressing ofthe tools in opposite directions. By the use of the springs l I thepresser blades are constantly and continuously held against the corneredges of the stock, throughout the length of the stock, and the bladesfollow the stock should any lateral or vertical movement occur, and theyalso follow any irregularities in the surface of the dressed or finishedstock.

The degree of compression, within limits, applied by the presser bladesto the corner edges, may be varied by varying the tension of the springsH, and the formation of the rounded or smoothed corner edges may bevaried by changing the shape or size of the concave bear- 20 ing face orgroove l6 of the presser blade.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent is:-

1. In a device as described, the combination with a base having asocket, a holder-pin having a reduced head journaled in the socket, andmeans for retaining the head in the socket, of a spring coiled about thepin and having its ends anchored to the base and pin respectively, saidholder pin having a longitudinally extending slot, a flat-presser blademounted in the slot and means for retaining the blade in position, andsaid blade having a bearing face as described.

2. In a device as described, the combination with a base having asocket, a holder pin having a reduced head journaled in said socket, andmeans for retaining the head in the socket, of a spring coiled about thepin and having its ends anchored to the base and pin respectively, meanson the pin for retaining the same in operable position, said holder pinhaving a longitudinally extending slot, a flat-presser blade mounted inthe slot and means for retaining the blade in position, and said bladehaving a bearing face as described.

3. In a device as described, the combination with a base having asocket, a holder pin having a reduced head journaled in said socket, andmeans for retaining the head in the socket, of a spring coiled about thepin and having its ends anchored to vthe base and pin respectively,means on the pin for retaining the same in operable position, saidholder pin having a longitudinally extending slot, a flat-presser blademounted in the slot and means for retaining the blade in position, andsaid blade having a concave bearing face as described.

HAROLD G. PIPER.

